Light source module

ABSTRACT

A light source module including a light guide plate, at least one light emitting device, a light-controlling pattern element, and an absorbing pattern element is provided. The light guide plate has a light emitting surface, a first surface opposite the light emitting surface, and at least one opening. The opening passes through the first surface and extends from the first surface toward the light emitting surface. The at least one light emitting device is disposed in the opening and arranged along an arranging direction. The light-controlling pattern element is disposed on the light emitting surface and covers the opening and the light emitting device. The opening faces towards the absorbing pattern element. The absorbing pattern element is disposed besides one of the at least one light emitting device and extends toward a side wall of the opening. Moreover, another two light source modules are also provided.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of Taiwan applicationserial no. 101109713, filed on Mar. 21, 2012. The entirety of theabove-mentioned patent application is hereby incorporated by referenceherein and made a part of this specification.

BACKGROUND

1. Field of the Invention

The invention relates to a light source module, and more particularly,the invention relates to a light source module including alight-controlling pattern element.

2. Description of Related Art

A conventional light source module includes a light guide plate having aplurality of recesses, a plurality of light emitting diode light barsdisposed in the recesses, at least one reflecting element and at leastone optical film. The light emitting diode light bars are locatedbetween the reflecting element and the light guide plate. The lightguide plate is located between the optical film and the light emittingdiode light bars. In the conventional light source module, although mostlight emitted by the light emitting diode light bars enters the lightguide plate from side walls of the recesses via a directionperpendicular to a light emitting surface of the light guide plate, aportion of the light exits the light emitting surface of the light guideplate from the top of the light emitting diode light bars and causes aproblem of the conventional light source module being overly bright atthe top of the light emitting diode light bars. In addition, theconventional light source module may be divided into a plurality ofregions by the plurality of recesses, and a problem of uneven lightmixing is prone to occur at an interception point of each region and theadjacent region, thus resulting in a poor uniformity.

Japanese Patent No. 2010177085 discloses a backlight unit including alight guide body, and a light emitting surface of the light guide bodyis disposed with a light diffusive member. Japanese Patent No.2009230163 discloses a backlight unit, and a spacing between a lightguide plate and a diffusive member thereof is less than 15 mm. JapanesePatent No. 2010090029 discloses a backlight unit, and a light emittingsurface of a light guide plate and a surface opposite to the lightemitting surface are disposed with diffusion points. Taiwanese PatentNo. I354812 discloses a backlight module including a light source, alight guide plate, and a reflection sheet. Taiwanese Patent No. I358004discloses a backlight module including a light guide plate and at leastone light source optically coupled with the light guide plate. TaiwanesePatent No. M366080 discloses a backlight module including an opticalfilm, and this optical film has a diffusion layer and a reflectionlayer. US Patent No. 20110141764 discloses a backlight module includinga reflection cavity. Chinese Patent No. 01122554 discloses a light guideplate, wherein a groove is disposed at a middle section thereofTaiwanese Patent No. M368093 discloses a sidelight type backlight moduleincluding a plurality of light guide plates, a plurality of lightsources, a plurality of shielding plates, a diffusion film, a brightnessenhancement film, and a reflection plate. US Patent No. 20110242794discloses a light emitting device having a plurality of light guideplates.

SUMMARY OF THE INVENTION

The invention provides a light source module capable of improving aproblem of a conventional light source module being overly bright at thetop of a light emitting diode light bar.

The invention provides another light source module capable of improvinga problem of uneven light mixing of a conventional light source module.

The invention further provides a light source module capable ofimproving a problem of uneven light mixing of a conventional lightsource module.

Other objectives and advantages of the invention may be known andfurther understood from technical features disclosed herein.

In order to achieve a partial or all objectives mentioned above or otherobjectives, a light source module is provided in one embodiment of theinvention. This light source module includes a light guide plate, atleast one light emitting device, a light-controlling pattern element,and an absorbing pattern element. The light guide plate has a lightemitting surface, a first surface opposite the light emitting surface,and at least one opening. The opening passes through the first surfaceand extends from the first surface toward the light emitting surface.The light emitting device is disposed in the opening and arranged alongan arranging direction. The light-controlling pattern element isdisposed on the light emitting surface and covers the opening and thelight emitting device. The opening faces towards the absorbing patternelements. Each absorbing pattern element is disposed besides the lightemitting device and extends toward a side wall of the opening.

A light source module is further provided in another embodiment of theinvention. This light source module includes a light guide plate, atleast one light emitting device, a light-controlling pattern element,and at least one optical film. The light guide plate has a lightemitting surface, a first surface opposite the light emitting surface,and at least one opening The opening passes through the first surfaceand extends from the first surface towards the light emitting surface.The light emitting device is disposed in the opening and arranged alongan arranging direction. The light-controlling pattern element isdisposed on the light emitting surface and covers the opening and thelight emitting device. The light-controlling pattern element is disposedbetween the light emitting surface and the optical film. A minimum widthof the light-controlling pattern element in a first direction is a. Thefirst direction intersects with the arranging direction. A shortestdistance from the light emitting surface to the optical film is h.Wherein, a and h satisfy a≦h.

A light source module is also provided in another embodiment of theinvention. This light source module includes a light guide plate, atleast one light emitting device, a light-controlling pattern element,and at least one optical film. The light guide plate has a lightemitting surface, a first surface opposite the light emitting surface,and at least one opening. The opening passes through the first surfaceand extends from the first surface towards the light emitting surface.The light emitting device is disposed in the opening and arranged alongan arranging direction. The light-controlling pattern element isdisposed on the light emitting surface and covers the opening and thelight emitting device. The light-controlling pattern element has atleast one first hole. A shortest distance between an edge of the firsthole and an edge of the light-controlling pattern element is d1. Thelight-controlling pattern element is disposed between the light emittingsurface and the optical film. A shortest distance from the lightemitting surface to the optical film is h. Wherein, d1 and h satisfyd1≦h.

According to the foregoing, in the light source module of one embodimentof the invention, the absorbing pattern element may absorb a portion oflight beam transmitting to a reflecting element, so as to improve theproblem of the conventional light source module being overly bright atthe tope of the light emitting device.

In the light source module of another embodiment of the invention, thelight source module may effectively be avoided from having a problem ofuneven light mixing near the light-controlling pattern element viaproperly designing a width of the light-controlling pattern element anda shortest distance between the light guide plate and the optical film.

In the light source module of another embodiment of the invention, thelight-controlling pattern element of the light source module has atleast one first hole, the light source module may be avoided from havinga problem of uneven light mixing near the light-controlling patternelement via a shortest distance between an edge of the first hole and anedge of the light-controlling pattern element and a shortest distancefrom the light emitting surface to the optical film.

Other objectives, features and advantages of the present invention willbe further understood from the further technological features disclosedby the embodiments of the present invention wherein there are shown anddescribed preferred embodiments of this invention, simply by way ofillustration of modes best suited to carry out the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a furtherunderstanding of the invention, and are incorporated in and constitute apart of this specification. The drawings illustrate embodiments of theinvention and, together with the description, serve to explain theprinciples of the invention.

FIG. 1 is a partial schematic perspective view of a light source moduleaccording to an embodiment of the invention.

FIG. 2 is a side view of FIG. 1.

FIG. 3 is a partial side view of a light source module according toanother embodiment of the invention.

FIG. 4A illustrates a light guide plate of FIG. 1.

FIG. 4B illustrates a light guide plate according to another embodimentof the invention.

FIG. 5 is a top perspective view of the light source module in FIG. 1.

FIG. 6 illustrates a light intensity distribution of light beams emittedby the light emitting device in FIG. 1 before passing through anycomponent.

FIG. 7 illustrates a light intensity distribution of the light beamsemitted by the light emitting device in FIG. 1 after passing through thelight guide plate and a light-controlling pattern element.

FIG. 8 is a partial side view of a light source module according toanother embodiment of the invention.

FIG. 9 is a partial schematic perspective view of a light source moduleaccording to another embodiment of the invention.

FIG. 10 is a top perspective view of the light source module in FIG. 9.

DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS

In the following detailed description of the preferred embodiments,reference is made to the accompanying drawings which form a part hereof,and in which are shown by way of illustration specific embodiments inwhich the invention may be practiced. In this regard, directionalterminology, such as “top,” “bottom,” “front,” “back,” etc., is usedwith reference to the orientation of the Figure(s) being described. Thecomponents of the present invention can be positioned in a number ofdifferent orientations. As such, the directional terminology is used forpurposes of illustration and is in no way limiting. On the other hand,the drawings are only schematic and the sizes of components may beexaggerated for clarity. It is to be understood that other embodimentsmay be utilized and structural changes may be made without departingfrom the scope of the present invention. Also, it is to be understoodthat the phraseology and terminology used herein are for the purpose ofdescription and should not be regarded as limiting. The use of“including,” “comprising,” or “having” and variations thereof herein ismeant to encompass the items listed thereafter and equivalents thereofas well as additional items. Unless limited otherwise, the terms“connected,” “coupled,” and “mounted” and variations thereof herein areused broadly and encompass direct and indirect connections, couplings,and mountings. Similarly, the terms “facing,” “faces” and variationsthereof herein are used broadly and encompass direct and indirectfacing, and “adjacent to” and variations thereof herein are used broadlyand encompass directly and indirectly “adjacent to”. Therefore, thedescription of “A” component facing “B” component herein may contain thesituations that “A” component directly faces “B” component or one ormore additional components are between “A” component and “B” component.Also, the description of “A” component “adjacent to” “B” componentherein may contain the situations that “A” component is directly“adjacent to” “B” component or one or more additional components arebetween “A” component and “B” component. Accordingly, the drawings anddescriptions will be regarded as illustrative in nature and not asrestrictive.

First Embodiment

Referring to FIG. 1 and FIG. 2, a light source module 1000 of theembodiment includes a light guide plate 100, at least one light emittingdevice 200, and a light-controlling pattern element 300. The lightsource module 1000 of the embodiment may further selectively include atleast one optical film 400. FIG. 1 and FIG. 2 illustrate a plurality oflight emitting devices 200, two light-controlling pattern elements 300,and a piece of optical film 400. However, the invention does not limitthe amount of the light emitting device, light-controlling patternelement, or the optical film, the amount thereof may be properlydesigned depending on an actual need.

Continually referring to FIG. 1 and FIG. 2, the light guide plate 100 ofthe embodiment has a light emitting surface 110, a first surface 120disposed opposite the light emitting surface 110, and at least oneopening 130. The opening 130 passes through the first surface 120 andextends from the first surface 120 towards the light emitting surface110. In the embodiment, the opening 130 does not pass through the lightemitting surface 110 of the light guide plate 100. However, theinvention is not limited thereto, and in other embodiments, the openingmay also pass through the light emitting surface of the light guideplate. Referring to FIG. 3, a light source module 1000A in FIG. 3 issimilar to the light source module 1000 in FIG. 2, and therefore sameelements are represented with the same notations. A difference betweenthe light source module 1000A and the light source module 1000 is that:the format of an opening 130A in FIG. 3 is slightly different from theformat of the opening 130 in FIG. 2. Specifically, in the light sourcemodule 1000A, the opening 130A may pass through the first surface 120and the light emitting surface 110.

Referring to FIG. 1 and FIG. 4A, the light guide plate 100 of theembodiment further has a second surface 140 and a third surface 150disposed opposite the second surface 140 (labeled in FIG. 4A). Thesecond surface 140 is connected with the light emitting surface 110 andthe first surface 120. The third surface 150 is also connected with thelight emitting surface 110 and the first surface 120. The opening 130,in addition to extending from the first surface 120 towards the lightemitting surface 110, may further be extending from the second surface140 towards the third surface 150. Furthermore, as shown in FIG. 4A, theopening 130 may selectively pass through the second surface 140 and thethird surface 150. In the embodiment, the opening 130 may be astrip-shaped recess. However, the invention is not limited thereto, andan appearance of the opening 130 may be properly changed depending onthe actual need. Moreover, if ignoring the part of opening 130, theappearance of the light guide plate 100 of the embodiment may generallybe a rectangular parallelepiped. In other words, as shown in FIG. 4A,the light emitting surface 110 may be parallel to the first surface 120.However, the invention is not limited thereto, and FIG. 4B illustrates alight guide plate according to another embodiment of the invention.Referring to FIG. 4B, if ignoring the part of opening 130, theappearance of a light guide plate 100′ of the embodiment may generallybe similar to a wedge plate. In other words, as shown in FIG. 4B, thelight emitting surface 110 is not parallel to the first surface 120. Itis to be explained that the light guide plates illustrated in FIG. 4Aand FIG. 4B are just provided as examples. The appearance of the lightguide plate in the invention may be properly designed depending on theactual need, and are not limited to the light guide plates illustrate inFIG. 4A and FIG. 4B.

Referring to FIG. 1 and FIG. 2 again, the light emitting devices 200 aredisposed in the openings 130 and arranged along an arranging direction D(illustrated in FIG. 1). The light emitting surface 110 and the firstsurface 120 may locate on two planes parallel to a xy plane, and thearranging direction D may be parallel to an x direction. In other words,the arranging direction D of the light emitting devices 200 may be thesame as one of the extending directions the openings 130. As shown inFIG. 2, most of the light beams L emitted by the light emitting device200 may enter the light guide plate 100 through two opposite side walls132 of the opening 130. The light beams L that entered the light guideplate 100 may leave the light guide plate 100 from the light emittingsurface 110 via an optical microstructure 160. In the embodiment, thelight emitting devices 200 may be light emitting diodes. However, theinvention is not limited thereto.

For the purpose of clear indication, illustrations of the optical film400, an absorbing pattern element 500, a reflecting element 600, and adriving circuit board 700 are omitted in FIG. 5 (relevant illustrationsplease refer to the following descriptions). Referring to FIG. 1 andFIG. 5, the light-controlling pattern elements 300 of the embodiment aredisposed on the light emitting surface 110 and cover the openings 130and the light emitting devices 200. In the embodiment, an extendingdirection of the light-controlling pattern elements 300 may be the sameas the arranging direction D of the light emitting devices 200.Furthermore, each of the light-controlling pattern elements 300 includesa wide portion 310 and a slender portion 320 connected with the wideportion 310, wherein an orthographic projection of the wide portion 310towards the direction of the light emitting surface 110 overlaps thelight emitting device 200, and when the wide portion 310 and the slenderportion 320 are in multiple amounts, the slender portions 320 arealternatively arranged with the wide portions 310. As shown in FIG. 5, afirst region R1 is existed between any two adjacent light emittingdevices 200, and the slender portion 320 overlaps the first region R1.

The light-controlling pattern element 300 of the embodiment has afunction of adjusting the light intensity distribution emitted by thelight emitting device 200. Furthermore, a light intensity difference ofthe light beams emitted by the light emitting device 200 in eachdirection is reduced after passing through the light-controlling patternelement 300, so that a problem of being overly bright of the top of thelight emitting device 200 is prevented. Please refer to FIG. 6 and FIG.7. It may be seen from FIG. 6 that the light intensity distributions ofthe light beams emitted by the light emitting device 200 are focused ina frontal direction (viz. z direction of FIG. 1) before passing throughany elements,. It may be seen from FIG. 7 that a light intensitydifference of the light beams emitted by the light emitting device 200in each direction is reduced after passing through the light guide plate100 and the light-controlling pattern element 300. In other words,through the light-controlling pattern element 300, the light sourcemodule 1000 of the embodiment is less prone to a problem of being overlybright at the tope of the light emitting device 200.

The light-controlling pattern element 300 of the embodiment may have afunction of reflecting the light beams. The light-controlling patternelement 300 may also have a function of scattering the light beams. Inaddition, the light-controlling pattern element 300 may further have afunction of absorbing the light beams. For example, thelight-controlling pattern element 300 of the embodiment is a whitereflective sheet adhered on the light emitting surface 110. However, theinvention is not limited thereto, in other embodiments, thelight-controlling pattern element 300 may also be a translucentscattering pattern (a reflectivity thereof may be higher than 70%), asilver reflective sheet, a metal pattern deposited on the light emittingsurface 110, or a pattern formed on the light emitting surface 110 viaprinting or ink jet method.

As shown in FIG. 5, in the embodiment, a width of the wide portion 310in the first direction D1 may be gradually reduced from two oppositeedges 210 of the light emitting device 200 towards the slender portions320 at the two sides of the wide portion 310. In the embodiment, thefirst direction D1 is substantially perpendicular to the arrangingdirection D. The wide portion 310 may have two second holes H2. The twosecond holes H2 expose a portion of the light emitting device 200. Awidth of a portion of the wide portion 310 between the two second holesH2 may the same in the first direction D1, wherein the wide portion 310may appear to be a wide flat octagon, and the slender portions 320 mayappear to be rectangles. However, the invention is not limited thereto,and in other embodiments, appearances of the wide portion 310 and theslender portions 320 may be adjusted depending on the actual need.

Continually referring to FIG. 1 and FIG. 5, any maximum width of thewide portion 310 in the first direction D1 is b (labeled in FIG. 5), anda thickness of the light guide plate is g (labeled in FIG. 1). In theembodiment, b and g may satisfy the following formula (1): b≦2g. Anymaximum width of the wide portion 310 in the arranging direction D(e.g., a direction parallel to the x direction) is c (labeled in FIG.5). A value of the width c may be designed in consideration of the widthw (labeled in FIG. 5) of the light emitting device 200 in the arrangingdirection D. In detail, in the embodiment, c, w and g may satisfy thefollowing formula (2): c≧2g+0.5w. When b, c, w and g satisfy any of thecorresponding formula (1) and formula (2), the light source module 1000is less prone to a light leakage problem under a large viewing angle.Moreover, referring to FIG. 1, in the embodiment, a shortest distancefrom the light emitting surface 110 to the optical film 400 is h, and athickness of the light guide plate is g, wherein h and g satisfy:g≦h≦3g. Herein, a uniformity of the light source module 1000 isfavorable.

Referring to FIG. 1 and FIG. 2, the light source module 1000 of theembodiment may selectively include at least one optical film 400. Thelight-controlling pattern element 300 is disposed between the lightemitting surface 110 and the optical film 400. A shortest distance fromthe light emitting surface 110 to the optical film 400 is h. When aportion (viz. the slender portion 320 labeled in FIG. 5) of thelight-controlling pattern element 300 overlapped with the first regionR1 (labeled in FIG. 5) may have at least one first hole H1, a shortestdistance between an edge of the first hole H1 and an edge of thelight-controlling pattern element is d1, wherein d1 and h may satisfythe following formula (3): d1≦h. When the portion of thelight-controlling pattern element 300 overlapped with the first regionR1 has at least two first holes H1, a shortest distance between edges ofthe two first holes H2 is d1′, wherein d1′ and h may satisfy thefollowing formula (4): d1′≦h.

In the embodiment, a portion (viz. the wide portion 310 labeled in FIG.5) of the light-controlling pattern element 300 overlapped with anyemitting device 200 may have at least one second hole H2. As shown inFIG. 2, the second hole H2 exposes the light emitting device 200. Ashortest distance between an edge of the second hole H2 and an edge ofthe light-controlling pattern element 300 is d2, wherein d2 an d h maysatisfy the following formula (5): d2≦h. In the embodiment, the portionof the light-controlling pattern element 300 overlapped with any lightemitting device 200 may have two second holes H2. A shortest distancebetween edges of the two second holes H2 is d2′, wherein d2′ and h maysatisfy the following formula (6): d2′≦h. The light-controlling patternelement 300 may prevent an excessive amount of the light beams leave thelight guide plate 100 from the top of the light emitting device 200, andthus improve a problem of a conventional light source module beingoverly bright at the tope of the light emitting device. Moreover, bydesigning the first hole H1, the second hole H2 or a combination thereofon the design of the light-controlling pattern element 300, a smallportion of the light beams is enabled to leave the light guide plate 100from the top of the light emitting device 200, thereby preventing aregion corresponded to light-controlling pattern element 300 in thelight source module 100 from a problem of having dark band. In addition,when d1, d1 d2, d2′ and h satisfy any of the corresponding formula (3),formula (4), formula (5) and formula (6), the light source module 1000is also less prone to a problem of uneven light mixing.

Referring to FIG. 5 again, the light guide plate 100 of the embodimentfurther has a plurality of optical microstructures 160. In theembodiment, the optical microstructures 160 may be disposed at the lightemitting surface 110. However, the invention is not limited thereto, andin other embodiments, the optical microstructures 160 may also bedisposed on the first surface 120. The optical microstructures 160 ofthe embodiment may be printing mesh points, inkjet dots, ormicrostructures formed on the light guide plate, but the invention isnot limited thereto.

As shown in FIG. 5, the light emitting surface 110 of the embodiment hasat least one second region R2 and a plurality of third regions R3. Thethird regions R3 are located between slender portions 312 and the secondregion R2. In the embodiment, the third regions R3 may be triangularregions, and the second region R2 may be an irregular region adjacent tothese triangular regions. A density of the optical microstructures 160in the third regions R3 may be greater than a density of the opticalmicrostructures 160 in the second regions R2. Furthermore, the lightemitting surface 110 may have at least one second region R2, a pluralityof third regions R3, and a plurality of fourth regions R4, wherein thefourth regions R4 are jointly surrounded by the second regions R2, thethird regions R3, and the wide portion 310. In the embodiment, theoptical microstructures 160 may be disposed in the second region R2 andthe third regions R3, and no optical microstructure is disposed in thefourth regions R4.

Referring to FIG. 1 and FIG. 2 again, the light source module 1000 ofthe embodiment may further include the absorbing pattern element 500.The opening 130 faces towards the absorbing pattern element 500. Inother words, the first surface 120 is located between the absorbingpattern element 500 and the light emitting surface 110. The absorbingpattern element 500 is disposed beside the light emitting device 200 andextends from the side walls 132 of the opening 130 of the light emittingdevice 200. In the embodiment, the absorbing pattern element 500 maysurround the light emitting device 200 and cover the two opposite sidewalls 132 of the opening 130. As shown in FIG. 2, a width of theabsorbing pattern element 500 in first direction D1 is p, a width of theopening 130 in the first direction D1 is r, and a shortest distance froma light emitting surface of the light emitting device 200 to the sidewall 132 is q. In the embodiment, p, q and r may satisfy the followingformula (7): 0.5≦q≦2r.

The light source module 1000 of the embodiment may further include thereflecting element 600. The opening 130 faces towards the reflectingelement 600. In other words, the first surface 120 is located betweenthe reflecting element 600 and the light emitting surface 110. In theembodiment, reflecting element 600 may have a plurality of through holes610. The light emitting device 200 may pass the through holes 610 and bedisposed in the opening 130. The absorbing pattern element 500 of theembodiment may be located between the reflecting element 600 and thefirst surface 120. Specifically, the absorbing pattern element 500 ofthe embodiment may be in contact with the reflecting element 600 andsurrounded at edges of the through holes 610. As shown in FIG. 2, theabsorbing pattern element 500 may block a portion of the light beams Ltransmitting to the reflecting element 600, so that bright stripes areless likely to be appeared on the tope of the light emitting device 200.In addition, the light beams L from a light emitting device 200′ have ahigher chance of being absorbed by the absorbing pattern element 500beside the light emitting device 200 when the light beams L exit fromthe light guide plate 100 and enter the opening 130, so that the brightstripes are less like to be appeared on the tope of the light emittingdevice 200. As such, the uniformity of the light source module 1000 ofthe embodiment may be enhanced obviously.

It is noted that a position of the absorbing pattern element 500 is notlimited to positions illustrated in FIG. 1 and FIG. 2. Referring to FIG.8, a light source module 1000B in FIG. 8 is similar to the light sourcemodule 1000 in FIG. 2, and therefore the same elements are representedwith the same notations. A difference between the light source module1000B and the light source module 1000 is that: a position of anabsorbing pattern element 500A is different from a position of theabsorbing pattern element 500. In detail, the light source module 1000Bmay further include the driving circuit board 700. The driving circuitboard 700 is electrically connected with the light emitting devices 200.The through holes 610 of the reflecting element 600 may expose thedriving circuit board 700 and the absorbing pattern element 500A. Theabsorbing pattern element 500A may be located between the drivingcircuit board 700 and the first surface 120. The absorbing patternelement 500A has similar effects as the absorbing pattern element 500,and thus is not repeated herein.

Second Embodiment

Please refer to FIG. 9 and FIG. 10. For a clear representation,illustrations of the optical film 400, the absorbing pattern element500, the reflecting element 600, and the driving circuit board 700 areomitted in FIG. 10. A light source module 1000C of the embodiment issimilar to the light source module 1000 of the first embodiment, andtherefore the same elements are represented with the same notations. Amain difference between the light source module 1000C and the lightsource module 1000 is that: light-controlling pattern elements 300A ofthe light source module 1000C are a bit different from thelight-controlling pattern elements 300 of the light source module 1000.The following below illustrates the difference between the two, whereasthe similarities thereof are not to be repeated.

The light-controlling pattern elements 300A of the embodiment may haveno openings. A minimum width of a portion of the light-controllingpattern elements 300A overlapped with the first region R1 in the firstdirection D1 is a. A shortest distance from the light emitting surface110 to the optical film 400 is h. Wherein, a and h may satisfy thefollowing formula (7): a≦h. When a and h satisfy the formula (7), in thelight source module 1000C, a light mixing distance between the twoopposite sides of the light-controlling pattern element 300A is enough,and the light source module 1000C is less likely to have a problem ofpoor uniformity. Moreover, the light guide plate 100 of the embodimentmay be integrally formed. However, the invention is not limited thereto,and in other embodiment, the light guide plate 100 may also be spliced.In addition, the light source module 1000C has effects and benefitssimilar to that of the light source module 1000, and thus is not to berepeated herein.

In the above-mentioned embodiment, the light-controlling pattern elementhas the wide portion and the slender portions; however, in otherembodiments, the light-controlling pattern element is not limited tohaving the wide portion and the slender portion, the light-controllingpattern element may be designed as a polygon, an irregular-shape, acircle, or an oval-shape according to different needs, and thelight-controlling pattern element may also not include a slenderportion, or have the opening on the slender portion or the wide portion.

In summary, the light source module of an embodiment of the inventionmay effectively avoid the light source module to have a problem ofuneven light mixing near the light-controlling pattern element byproperly designing the width of the light-controlling pattern elementand the shortest distance between the light guide plate and the opticalfilm.

In the light source module of another embodiment of the invention, theabsorbing pattern element may be disposed at the periphery of the lightemitting device. This absorbing pattern element may absorb a portion ofthe light beams transmitting to the reflecting element, therebyimproving the problem of the conventional light source module beingoverly bright at the tope of the light emitting device.

The foregoing description of the preferred embodiments of the inventionhas been presented for purposes of illustration and description. It isnot intended to be exhaustive or to limit the invention to the preciseform or to exemplary embodiments disclosed. Accordingly, the foregoingdescription should be regarded as illustrative rather than restrictive.Obviously, many modifications and variations will be apparent topractitioners skilled in this art. The embodiments are chosen anddescribed in order to best explain the principles of the invention andits best mode practical application, thereby to enable persons skilledin the art to understand the invention for various embodiments and withvarious modifications as are suited to the particular use orimplementation contemplated. It is intended that the scope of theinvention be defined by the claims appended hereto and their equivalentsin which all terms are meant in their broadest reasonable sense unlessotherwise indicated. Therefore, the term “the invention”, “the presentinvention” or the like does not necessarily limit the claim scope to aspecific embodiment, and the reference to particularly preferredexemplary embodiments of the invention does not imply a limitation onthe invention, and no such limitation is to be inferred. The inventionis limited only by the spirit and scope of the appended claims.Moreover, these claims may refer to use “first”, “second”, etc.following with noun or element. Such terms should be understood as anomenclature and should not be construed as giving the limitation on thenumber of the elements modified by such nomenclature unless specificnumber has been given. The abstract of the disclosure is provided tocomply with the rules requiring an abstract, which will allow a searcherto quickly ascertain the subject matter of the technical disclosure ofany patent issued from this disclosure. It is submitted with theunderstanding that it will not be used to interpret or limit the scopeor meaning of the claims. Any advantages and benefits described may notapply to all embodiments of the invention. It should be appreciated thatvariations may be made in the embodiments described by persons skilledin the art without departing from the scope of the present invention asdefined by the following claims. Moreover, no element and component inthe present disclosure is intended to be dedicated to the publicregardless of whether the element or component is explicitly recited inthe following claims.

What is claimed is:
 1. A light source module comprising: a light guideplate having a light emitting surface, a first surface opposite thelight emitting surface, and at least one opening, wherein the openingpasses through the first surface and extends from the first surface tothe light emitting surface; at least one light emitting device disposedin the opening and arranged along an arranging direction; alight-controlling pattern element disposed on the light emitting surfaceand covering the opening and the light emitting device; and at least oneoptical film, the light-controlling pattern element disposed between thelight emitting surface and the optical film, a minimum width of thelight-controlling pattern element in a first direction being a, thefirst direction intersected with the arranging direction, and a shortestdistance from the light emitting surface to the optical film being h,wherein a and h satisfy h.
 2. The light source module as recited inclaim 1, wherein the light-controlling pattern element has at least onefirst hole, a shortest distance between an edge of the first hole and anedge of the light-controlling pattern element is d1, and d1 and hsatisfy d1≦h.
 3. The light source module as recited in claim 1, whereinthe light-controlling pattern element has at least two first holes, ashortest distance between edges of the first holes is d1′, and d1′ and hsatisfy d1′≦h.
 4. The light source module as recited in claim 1, whereina portion of the light-controlling pattern element overlapping the lightemitting device has at least one second hole, and the second holeexposes a portion of the light emitting device.
 5. The light sourcemodule as recited in claim 4, wherein a shortest distance between anedge of the second hole and an edge of the light-controlling patternelement is d2, and d2 and h satisfy d2≦h.
 6. The light source module asrecited in claim 5, wherein the at least one second hole is two secondholes, a shortest distance between edges of the second holes is d2′, andd2′ and h satisfy d2′≦h.
 7. The light source module as recited in claim1, wherein the light-controlling pattern element comprises a wideportion and a slender portion connected with the wide portion.
 8. Thelight source module as recited in claim 7, wherein the at least onelight emitting device is a plurality of light emitting devices, a firstregion is existed between any two of the adjacent light emittingdevices, and the slender portion overlaps the first region.
 9. The lightsource module as recited in claim 7, wherein a maximum width of the wideportion in the first direction is b, a thickness of the light guideplate is g, and b and g satisfy b≦2g.
 10. The light source module asrecited in claim 7, wherein the at least one light emitting device is aplurality of light emitting devices, a maximum width of the wide portionin the arranging direction is c, a width of any one of the lightemitting devices in the arranging direction is w, a thickness of thelight guide plate is g, and c, w, and g satisfy c≧2g+0.5w.
 11. The lightsource module as recited in claim 1, wherein a thickness of the lightguide plate is g, and h and g satisfy g≦h≦3g.
 12. The light sourcemodule as recited in claim 1, wherein the first direction issubstantially perpendicular to the arranging direction.
 13. The lightsource module as recited in claim 1 further comprising: an absorbingpattern element, the opening facing towards the absorbing patternelement, and the absorbing pattern element disposed besides the lightemitting device and extending toward a side wall of the opening.
 14. Alight source module comprising: a light guide plate having a lightemitting surface, a first surface opposite the light emitting surface,and at least one opening, wherein the opening passes through the firstsurface and extends from the first surface toward the light emittingsurface; at least one light emitting device disposed in the opening andarranged along an arranging direction; a light-controlling patternelement disposed on the light emitting surface and covering the openingand the light emitting device; and an absorbing pattern element, theopening facing towards the absorbing pattern element, the absorbingpattern element disposed besides the light emitting device and extendingtoward a side wall of the opening.
 15. The light source module asrecited in claim 14 further comprising a reflecting element, the openingfacing towards the reflecting element, the reflecting element having athrough hole, and the light emitting device penetrated through thethrough hole and disposed in the opening.
 16. The light source module asrecited in claim 15 further comprising: a driving circuit boardelectrically connected with the light emitting device, the through holeexposing the driving circuit board, and the absorbing pattern elementlocated between the driving circuit board and the first surface.
 17. Thelight source module as recited in claim 14 further comprising: areflecting element, the opening facing towards the reflecting element,and the absorbing pattern element located between the reflecting elementand the first surface.
 18. The light source module as recited in claim14 further comprising: at least one optical film, the light-controllingpattern element disposed between the light emitting surface and theoptical film, a shortest distance from the light emitting surface to theoptical film being h, a minimum width of the light-controlling patternelement in a first direction being a, and the first directionintersected with the arranging direction, wherein a and h satisfy a h.19. The light source module as recited in claim 18, wherein the firstdirection is substantially perpendicular to the arranging direction. 20.The light source module as recited in claim 14 further comprising: atleast one optical film, the light-controlling pattern element disposedbetween the light emitting surface and the optical film, a shortestdistance from the light emitting surface to the optical film being h,the light-controlling pattern element having at least one first hole,and a shortest distance between an edge of the first hole and an edge ofthe light-controlling pattern element being d1, wherein d1 and h satisfyd1
 21. The light source module as recited in claim 14 furthercomprising: at least one optical film, the light-controlling patternelement disposed between the light emitting surface and the opticalfilm, a shortest distance from the light emitting surface to the opticalfilm being h, the light-controlling pattern element having at least twofirst holes, and a shortest distance between edges of the first holesbeing d1′, wherein d1′ and h satisfy d1′≦h.
 22. The light source moduleas recited in claim 14, wherein a portion of the light-controllingpattern element overlapping the light emitting device has at least onesecond hole, and the second hole exposes a portion of the light emittingdevice.
 23. The light source module as recited in claim 22 furthercomprising: at least one optical film, the light-controlling patternelement disposed between the light emitting surface and the opticalfilm, a shortest distance from the light emitting surface to the opticalfilm being h, and a shortest distance between an edge of the second holeand an edge of the light-controlling pattern element being d2, whereind2 and h satisfy d2≦h.
 24. The light source module as recited in claim22 further comprising: at least one optical film, the light-controllingpattern element disposed between the light emitting surface and theoptical film, a shortest distance from the light emitting surface to theoptical film being h, the at least one second hole is two second holes,and a shortest distance between edges of the second holes being d2′,wherein d2′ and h satisfy d2′≦h.
 25. The light source module as recitedin claim 14, wherein the at least one light emitting device is aplurality of light emitting devices, a first region is existed betweenany two of the adjacent light emitting devices, the light-controllingpattern element comprises a wide portion and a slender portion connectedwith the wide portion, and the slender portion overlaps the firstregion.
 26. The light source module as recited in claim 25, wherein amaximum width of the wide portion in a first direction is b, the firstdirection intersects with the arranging direction, a thickness of thelight guide plate is g, and b and g satisfy b≧2g.
 27. The light sourcemodule as recited in claim 25, wherein the at least one light emittingdevice is a plurality of light emitting devices, a maximum width of thewide portion in the arranging direction is c, a width of any one of thelight emitting devices in the arranging direction is w, a thickness ofthe light guide plate is g, and c, w, and g satisfy c≧2g+0.5w.
 28. Thelight source module as recited in claim 14 further comprising: at leastone optical film, the light-controlling pattern element disposed betweenthe light emitting surface and the optical film, a shortest distancefrom the light emitting surface to the optical film being h, and athickness of the light guide plate being g, wherein h and g satisfyg≦h≦3g.
 29. A light source module comprising: a light guide plate havinga light emitting surface, a first surface opposite the light emittingsurface and at least one opening, wherein the opening passes through thefirst surface and extends from the first surface toward the lightemitting surface; at least one light emitting device disposed in theopening and arranged along an arranging direction; a light-controllingpattern element disposed on the light emitting surface and covering theopening and the light emitting device, the light-controlling patternelement having at least one first hole, and a shortest distance betweenan edge of the first hole and an edge of the light-controlling patternelement being d1; and at least one optical film, the light-controllingpattern element disposed between the light emitting surface and theoptical film, a shortest distance from the light emitting surface to theoptical film being h, wherein d1 and h satisfy d1≦h.
 30. The lightsource module as recited in claim 29, wherein the first direction issubstantially perpendicular to the arranging direction.
 31. The lightsource module as recited in claim 29, wherein the at least one lightemitting device is a plurality of light emitting devices, a first regionis existed between any two of the adjacent light emitting devices, aminimum width of a portion of the light-controlling pattern elementoverlapping the first region in the first direction is a.
 32. The lightsource module as recited in claim 29, wherein the at least one firsthole is two first holes, a shortest distance between edges of the firstholes is d1′, and d1′ and h satisfy d1′≦h.
 33. The light source moduleas recited in claim 29, wherein the portion of the light-controllingpattern element overlapping the light emitting device has at least onesecond hole, and the second hole exposes a portion of the light emittingdevice.
 34. The light source module as recited in claim 33, wherein ashortest distance between an edge of the second hole and an edge of thelight-controlling pattern element is d2, and d2 and h satisfy d2≦h. 35.The light source module as recited in claim 33, wherein the at least onesecond hole is two second holes, a shortest distance between edges ofthe second holes is d2′, and d2′ and h satisfy d2′≦h.
 36. The lightsource module as recited in claim 29, wherein the at least one lightemitting device is a plurality of light emitting devices, a first regionis existed between any two of the adjacent light emitting devices, thelight-controlling pattern element comprises a wide portion and a slenderportion connected with the wide portion, and the slender portionoverlaps the first region.
 37. The light source module as recited inclaim 36, wherein a maximum width of the wide portion in a firstdirection is b, the first direction intersects with the arrangingdirection, a thickness of the light guide plate is g, and b and gsatisfy b≧2g.
 38. The light source module as recited in claim 36,wherein a maximum width of the wide portion in the arranging directionis c, a width of any one of the light emitting devices in the arrangingdirection is w, a thickness of the light guide plate is g, and c, w, andg satisfy c≧2g+0.5w.
 39. The light source module as recited in claim 29,wherein a thickness of the light guide plate is g, and h and g satisfyg≦h≦3g.
 40. The light source module as recited in claim 31 furthercomprising: an absorbing pattern element, the opening facing towards theabsorbing pattern element, the absorbing pattern element disposedbesides the light emitting devices and extending toward a side wall ofthe opening.